1/ f noise through the metal–nonmetal transition in percolating composites

We have measured the 1/f noise through the metal–nonmetal transition in carbon black/polymer composites as a function of temperature and doping. At the electronic transition, the resistivity power spectrum Sρ varies as Sρ∼ρQ, with Q=2.77, in agreement with classical three-dimensional percolation. At...

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Veröffentlicht in:Applied physics letters 2000-01, Vol.76 (5), p.592-594
Hauptverfasser: Breeze, A. J., Carter, S. A., Alers, G. B., Heaney, M. B.
Format: Artikel
Sprache:eng
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Zusammenfassung:We have measured the 1/f noise through the metal–nonmetal transition in carbon black/polymer composites as a function of temperature and doping. At the electronic transition, the resistivity power spectrum Sρ varies as Sρ∼ρQ, with Q=2.77, in agreement with classical three-dimensional percolation. At lower temperatures, a crossover to tunneling-dominated transport occurs with Sρ∼ln Sρ/ρ2. Our results show that 1/f noise can be a more sensitive technique than resistivity itself for probing transport behavior near a percolation-induced electronic transition.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.125827